Int to String converstion breaking in function

I'm having a great deal of trouble stemming from a part in my code where I have to convert an integer into a string so that I can concatenate it - the problem being that a variable is refusing to clear or re-write itself, instead it just appends the new data when it ought to replace the old with the new completely. Here's some sample code, and where it's breaking:

As I said above, converter just appends the new data when I want it replaced no matter what I do. It's important that it's replaced because I'm running the code in a for loop in my main program, so converter is used to convert int to string over and over.

I would greatly appreciate any help. I've spent literal hours trying to figure out the problem on my own.

Hi. so this is actually a continuation from another question of mine[Here](https://www.daniweb.com/programming/software-development/threads/506795/dynamically-add-values-into-datagridview-cell-from-listbox-vb2010) but i was advised to start a new thread as the original question …

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